發(fā)布時間：2018-04-04 14:24

  本文選題：甲醛　切入點：苯　出處：《分析化學》2017年06期

【摘要】：基于甲醛、苯和二氧化硫在納米Ti_3Ce Y_2O_(11)上的催化發(fā)光有交叉敏感現(xiàn)象,在3個波長處分別確定甲醛、苯和二氧化硫濃度與催化發(fā)光信號強度的響應關系,再依據(jù)發(fā)光信號強度的疊加性特征即可獲取甲醛、苯和二氧化硫的準確濃度,據(jù)此建立了同時測定空氣中甲醛、苯和二氧化硫的新方法。3個分析波長分別為420、535和680 nm,敏感材料表面溫度為280℃,載氣流速為130 m L/min。本方法對甲醛、苯和二氧化硫的檢出限(3σ)分別為0.04、0.05和0.10 mg/m3,線性范圍分別為0.08~75.60 mg/m~3、0.10~101.40 mg/m~3和0.30~115.00 mg/m~3,回收率分別為96.4%~103.7%、97.8%~102.5%和97.2%~103.3%。常見共存物,如乙醛、甲苯、硫化氫、氨、甲醇、乙醇和二氧化碳等不干擾測定。連續(xù)200 h通濃度均為50 mg/m3的甲醛、苯和二氧化硫混合氣體,發(fā)光強度的相對偏差≤2%,表明此納米級復合氧化物對甲醛、苯和二氧化硫的敏感性的壽命長。本方法充分利用了交叉敏感現(xiàn)象,可以實現(xiàn)空氣中甲醛、苯和二氧化硫的在線分析。
[Abstract]:Based on formaldehyde, benzene and sulfur dioxide, the catalytic luminescence on nanometer Ti_3Ce Y _ 2O _ 2 has cross-sensitivity phenomenon. The response relationship between the concentration of formaldehyde, benzene and sulfur dioxide and the intensity of catalytic luminescence signal is determined at three wavelengths, respectively.The accurate concentration of formaldehyde, benzene and sulfur dioxide can be obtained according to the superposition characteristics of luminous signal intensity. Based on this, the simultaneous determination of formaldehyde in air is established.The three analytical wavelengths of benzene and sulfur dioxide are 420535 and 680nm, respectively. The surface temperature of sensitive materials is 280 鈩，

本文編號：1710340